| A | B |
|---|
| tolerance | ability to survive and reproduce under a range of environmental circumstances |
| niche | the range of physical and biological conditions in which a species lives and the way the species obtains what it needs to survive and reproduce |
| habitat | the general place where an organism lives |
| resource | any necessity of life, such as water, sunlight, space, shelter, nutrients |
| competitive exclusion principle | no two species can occupy exactly the same niche at the same time |
| predation | an interaction in which one animal (the predator) captures and feeds on another animal (the prey) |
| herbivory | an interaction in which the herbivore feeds on producers |
| keystone species | changes in this species causes dramatic changes in the structure of the community |
| symbiosis | two species live closely together |
| mutualism | both species benefit |
| parasitism | one organism harms the other |
| commensalism | one organism benefits and the other is not helped or harmed |
